.box-hover
{
    position: relative;
    border: 1px solid #FFFFFF;
    border-radius: 3px;
    cursor: pointer;
}
.box-hover:hover
{
    color: #22b846;
    border: 1px solid #22b846;
    background-color: #FFFFFF;
}
.box-hover:hover .box-hover-tri
{
    display: block;
}

.box-hover-tri
{
    display: none;
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    border-left:10px solid transparent;
    border-top:10px solid transparent;
    border-bottom:10px solid #22b846;
    border-right:10px solid #22b846;

}
